Means for holding chasers



Aug- 1933. E. "r. BYSSHE ET AL MEANS FOR HOLDING CHASERS Original Filed Feb. 25, 19250 Patented Aug. 29, 1933 UNITED STATES PATENT OFFICE Vt., assignors to Jones & Lamson Machine Company, Springfield, Vt., a corporation of Vermont Original application February 25, 1930, Serial No.

Divided and this application August 25, 1932. Serial No. 630,352

6 Claims.

This invention relates to means for holding chasers, more particularly of the tangent type in a manner suitable for employment in screw cutting dies and has for an object to provide means which will facilitate the return of the chasers after removal from their holding means into exactly the same positions in which they were positioned before removal, or into positions removed from their former positions by definite determined amounts, and by which if desired micrometer adjustment is possible.

This application is a division of our application Serial No. 431,498, filed February 25, 1930, for Automatic dies.

For a more complete understanding of this invention, reference may be had to the accompanying drawing in which Figure 1 is a fragmentary side elevation of a die embodying this invention.

Figure 2 is a front elevation of the same, one of the chaser holders being shown partly in section.

Figure 3 is a view similar to a portion of Figure 2, but to a larger scale.

Figure 4 is a view similar to Figure 3, but showing the chaser released.

Figures 5 and 6 are views similar to Figures 3 and 4, respectively, but showing a modified construction including a micrometer adjustment.

Figure '7 is a fragmentary top plan to a smaller scale of the construction of Figures 5 and 6.

As shown in Figures 1 and 2, the chasers may be carried by a die body 1 through the medium of chaser holders 6, each having a dovetail portion '7 slidably fitting a correspondingly shaped groove 5 in the die body, sliding of these holders from and toward the axis of the body serving to open or close the die as more fully disclosed in the parent application for patent hereinbefore mentioned. These cooperating parts, including the forward face of the body 1 and the mating rear face of the holders 6, should be ground and lapped accurately to form so that the die holders may be held accurately in proper position. There may be clearance at the root of the portion '7. The rear face 8 of each die holder rests squarely and flat against the forward face portion 4 of the body member 1. Thus the chaser holder is accurately supported free from liability of rocking or other play. One side face of each holder 6 is provided with means for receiving and accurately holding a chaser 10, which, as shown, is of the tangent type.

In order to secure the chasers with capability of accurate adjustment but at the same time firmly in any desired'adjusted position, the side face 11 of each holder is shown as provided with a dovetail slot 12 and the chaser 10 is provided with a mating dovetail portion 13. Means are provided for fixing the chasers longitudinally relative to their holders. The rear face 15 of each chaser at the dovetail 13 is provided with.

ratchet serrations and fitting these serrations and slidable in an aperture 18 in a corresponding holder, in the construction shown in Figures 2, 3 and 4, is a plug 19 having its outer end face 20 shaped to mate the serrations 15. As shown this plug 19 is pressed into contact with the chaser as by means of a spring 21 seated in a socket in the rear end of the plug and reacting against the rear face 22 of a chamber 24 within which the plug 19 is slidably' fitted. The plug 19 is laterally perforated as at 191 for the passage therethrough of a stem 192 of a locking and releasing plug 193. The stem 192 is smaller than the perforation 191 but has a head 194 at its inner end having its opposite end faces beveled which is of a size to slidingly fit this perforation. This head is also slidable into and out of a socket portion 195 in the chaser holder. The plug 193 has a threaded portion 196 engaging in a mating threaded opening 197 in the chaser holder and has a head 198 which at its end may be provided with a polygonal socket 199 to receive an actuating tool by which it may be turned. At the inner end of the threaded portion is a circular shoulder 200 which may enter a counterbored portion 201 at the outer end of the plug passage. This shoulder is of sufficiently smaller diameter than the counterbore to permit the plug 19 to adjust itself to the toothed face of the chaser, but the difference in size is too small to permit the lug to become disengaged therefrom. By unscrewing the plug 193, however, this shoulder is first withdrawn from the counterbore and the tapering'rear end of the head 194 then engages the upper wall portion of the perforation 191 and wedges the plug 19 against the action of the spring 21 out of engagement with the chaser whereupon the chaser can be removed. The tapering front end of the head 194 exerts a similar releasing action on insertion of the plug 193 after it has been removed for any reason.

The serrations 15 of the chaser may act as a gage in the sharpening operation, at each grinding operation the amount of stock removed being equal to the space between adjacent serrations. The chasers can then be returned to position in the die with assurance that the cutting edges will be in the same relation to the work as before at one side within which end of a late l plug se ted in a perforab e holder 5 as by 1 o positioned in a in the plug 26 and engaging the wall of the perforation 27. Ihis plug 190 is ably mounted in a carrier axia ly rotatable in the holder 6, the plug 19 being eccentrical y mounted relative to the axis inserted in a polygonal By such rotation 5 moved with a component of motion 9 of the chaser "us to move the chaser carrier 38 may be provided t yi .dably in any adjusted an ular positions, comprise a plug art: the periphery of the mem er by a spring 3? housed in a memher 370 threaded in the ch. 1' holder so as to enter in any selected one of a series of peripheral recesses 38 therein brought opposite to this pointed end.

Ion gthw will be noted that of the various dcfeed means which secures the chaser i aaken care oi by the be ring oi the c' .ie l'd portion of hcide Not only des this make or s' pier rigid and accurate and stronger conout it also avoids W rping or other of the chest/rs and holders occasioned ping elements trcon.

y ll From the forego 1g bodirnents or" this ention which have been presented by way of enainple, and not of li tion, it should be evlde. those skilled in art that the invention might be embodied. various other forms without departure from its spirit or scope as by the appended claims.-

We claim:

1. In combination, a chaser holder, at chaser of the tangent tyne carried by said holds with capability of adj stinent longitudinally thereon, means for reta ng chaser in adjusted posi-- tion, and means carried by said holder and cooperating with saio. retaining means actuable to lock said retaining means in retaining position or to move and hold said out of retaining position.

2. In combination, a chaser holder, chaser of the tangent type carried by said holder with capability of movement lon tudinally thereon, a plug spring pressed at 'nst said chaser to hold said oh? r in fixed position, and a member rnovable lo aliyof the pre 1g movement of plug and cooperating with said plug in one position to hold said plug in chaser-holding position and in anoter position to hold said plug out of chaser-holding position.

As there shown the plug 190- iption of certain ere 3. In combination, a chaser holder, a chaser carried by said holder with capability of longi tudinal movement thereon, said holder having a socket, a plug in said socket, a spring in said socket for pressing said plug against said chaser, said chaser and plug having engaging faces preventing movement of said chaser when engaged by said plug, said plug haviru an opening therethro gn transverse to its pr ing movement, and a member projectable through said opening and havhg a portion engageable with said plug for removing said plug from contact with said chaser by movement of said member.

l. In combination, a chaser holder, a chaser carried by said holder with capability of longitudinal movement thereon, said holder having a socket, a plug n said socket and slidable therein toward and fro said chaser, a spring in said socket for pressing said plug against said chaser, said bhaser and plug having engaging faces preventing move ent of said chaser when engaged by said plug, said plug having a lateral opening therethrough, and a member projectable through said opening and having a portion engageable with said plug for removing said plug from contac with chasm by movement 01 said member and a portion engageable with said plug for locking said plug against releasing said chaser.

5. In combination, a chaser holder having a lid-sway, a chaser having a portion riding in aid slideway, said holder having a socket opensaicl slideway, a plu -slidably fitting in id 'ociaet for movement toward and from said a spring for pressing said plug against chaser porti n, the confronting faces of chaser pm. by said plug portion hol t; 'e to said holde; so.

ogagernent with said chaser against :novornent relaid holder having a passage in said pas age and projectable through .said 0; e; ing, said member having a large diameter 01-"011 when in opening holding said plug retra ted flOlll'fii-lld chaser.

in combination, a chaser holder having a 6. slidew y, a chaser having a portion'riding in said slideway, said holder having a soclzetcpeni into vsaid slideway, a. plug in said socket/a .o for-pressing 59: p0 the confrontfaces of said chaser portion and plug being so ated whereby said plug when in engagement'with said chaser portion holds said chaser against movement relative to 'ERNEST r. BYSSHE.

ROBERT Rh FINN.

cting said socltet, said plug having an open- K therethro .j laterally of its direction of slidrnovernent, and member axially movable plug against said chaser 

